I've got a 18' 74 Glencoe with a 455 Olds with Bassets, Edelbrock manifold, 750 Holley, and a Jacuzzi Pump. Recently threw a rod and am ready to retire the Olds. Question is how much trouble will it be to swap in a 454? Have been told by many that it is a simple swap, told by others that it might be more trouble than it's worth? Any advice or leads as to where to get started would be much appreciated.